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sluggish performance wont go past 35 mph.


 
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cksport
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Joined: 17 May 2007

PostPosted: Fri May 18, 2007 7:19 pm    Post subject: sluggish performance wont go past 35 mph. Reply with quote

yeah when i bought my 1993 Jeep Cherokee with a 4.0L HO AW4 auto and a NP231 transfer case it had a bad CPS so I went thru mopar and bought a new one for $102.40 it ran great for a while (223 miles out of a half of a tank of 87 octane) but shortly after i replaced the plugs with a set of Autolite 985 Copper cores and it started running like poo i regapped the plugs and installed a set of Bosch Ultra Premium plug wires but to no avail the motor has 176083 miles on it it idles fine at 750 rpm but it wont rev past 2500 then after the motor warms up 2000 i changed the oil in it and added a bottel of Engine Restore with CSL additave to my oil but still to no avail my compression readins are as follows cyl 1 134, cyl 2 138, cyl 3 132, cyl 4 135, cyl 5 133, cyl 6 128 the truck is slugglish won't get up and go and on a good day won't go past 35 mph. the compression came up to full in 3 strokes, the head is 2 years old the fuel pressure regulator is good i can't figure it out

any help would be greatly appreaceted thank you all very much
Brian a.k.a cksport
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cksport
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Joined: 17 May 2007

PostPosted: Fri May 18, 2007 7:20 pm    Post subject: Reply with quote

i also replaced the intank fuel strainer and the fuel filter
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Tardis
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Joined: 07 Aug 2004
Location: Ohio

PostPosted: Fri May 18, 2007 9:13 pm    Post subject: Reply with quote

Any engine codes?
Dirty air filter?
Blocked air inlet?
Check the coil and coil wire.
Check your fuel filter.
Test the fuel pressure.
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Orangeamc13
Got Rev Limiter?
Got Rev Limiter?


Joined: 20 Feb 2006
Location: East Springfield, Massachusetts - U.S.A.

PostPosted: Sat May 19, 2007 8:36 am    Post subject: Reply with quote

Try changing the Autolites for Champions. If it ran fine until you changed the plugs, I would think they are the problem.
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cksport
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Joined: 17 May 2007

PostPosted: Sat May 19, 2007 9:40 am    Post subject: Reply with quote

i've used autolite exclusively before it had bosch copper cores in it but its worth a try
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cksport
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Joined: 17 May 2007

PostPosted: Sat May 19, 2007 2:37 pm    Post subject: Reply with quote

ha ha it was the cataltic converter it was plugged now it runs great
i pushed it to 100 or more today
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